This manual covers the Hydraulic Excavator, specifically models with serial numbers 37728 and up, and types A 900 C ZW Litronic 1033, 1384, and 1385. The Hydraulic Excavator is engineered for demanding hydraulic excavation tasks, built with the robust construction and reliability characteristic of equipment. Its advanced Litronic system ensures efficient operation and precise control, making it a powerful tool for various construction and industrial applications. This comprehensive service repair factory manual provides detailed, step-by-step instructions designed to assist owners, mechanics, and technicians in maintaining and repairing the Hydraulic Excavator. It covers a wide range of essential systems and components, including general information, tools, technical data, engine, clutch, hydraulic systems and components, electrical systems, swing gear and ring, transmission, axles, steering, brake systems, special attachments, and the cab and air conditioning. The manual is presented in an easy-to-navigate format, enabling clear viewing and efficient use for self-service and cost savings.